Lsi Corporation

Agere Systems Inc.

Ellis E Nease

Shawn Michael Logan

Ashley Rebelo

Christopher J Wittensoldner

An electronic device package includes first and second electrodes of a package substrate. The first electrode has fingers formed from a first metal level and is configured to operate at a first DC potential. The second electrode has fingers formed from the first metal level interdigitated with the fingers of the first electrode. A via conductively connects the second electrode to a second metal level. The second metal level is configured to operate at a second DC potential. The first and second DC potentials are thereby capacitively coupled through the interdigitated electrodes.

Decoupling capacitor

An integrated circuit package having a multi-segment transmission line transformer for impedance matching a packaged integrated circuit, such as a driver or receiver, to a printed circuit board (PCB) transmission line to which the packaged chip is attached by, for example, solder balls. In one exemplary embodiment, a three-segment transmission line transformer provides improved broadband performance with the advantage of having a middle segment with a flexible length for easier routing. The length of each end segment of the three-segment transformer is adjusted to provide at least partial cancellation of reflections between the PCB and the transformer, and between the transformer and a circuit on the integrated circuit, respectively. Further, the inductive reactance of the solder balls and via wiring may be cancelled out by the transformed chip impedance to provide a non-inductive termination to the PCB transmission line at approximately one-half the highest data rate of the channel.

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Kutztown, PA, United States of America

Ellis E Nease